Coke oven door and jamb cleaners

ABSTRACT

Apparatus for cleaning sealing surfaces of a door assembly for a coke oven has a first header arranged for directing steam onto sealing surfaces at the bottom end of either a door or doorjamb to be cleaned, and a second header arranged for directing steam onto sealing surfaces at the top end of the same door or doorjamb. A third header is mounted on a carriage movable between the first and second headers for directing steam onto sealing surfaces between the top and bottom ends. The cleaning apparatus has a main frame provided with spaced ends, between which extends a guide rail guidingly engaged by the carriage. When specifically intended to be used for cleaning a coke oven door, the first and second headers are pivotally mounted on the main frame; the travel of the third header on the carriage is used to swing the first and second headers in a plane passing between the ends of the main frame when the third header is adjacent the first or second header. Further, this same movement of the third header is used to intermittently actuate valves supplying steam to the first and second headers. When specifically intended to clean a coke oven doorjamb, the first and second headers are mounted on a pair of further carriages also arranged engaging the guide rail and connected to the chain sprocket arrangement. These first and second headers are arranged so that the third header, which is also pivotally mounted on its carriage, and the first and second headers will swing in a plane passing between the ends of the main frame at appropriate times in an operating cycle of the apparatus. Advantageously, the steam used by a cleaning apparatus according to the present invention is dry steam under a pressure of 250 psi.

COKE OVEN DOOR AND JAMB CLEANERS [75] Inventors: William R. Baird,Sturgis', Kenneth 0. Sutton, Morganfield, both of Ky.

[73] Assignee: Saturn Machine & Welding Co.,

Inc., Sturgis, Ky.

[22] Filed: Mar. 2, 1973 [21] Appl. No.: 337,303

[52] US. Cl 202/241, 15/93 A, 15/302, 134/144, 134/172 [51] lint. ClCl0b 43/04, 1308b 3/00 [58] Field of Search 202/241, 269, 248; 201/2,201/2.5; 15/93 A, 302; 134/144, 151, 172

[56] References Cited UNITED STATES PATENTS 3,056,699 10/1962 Randell etal 15/93 A 3,454,426 7/1969 Taylor 202/241 3,745,110 7/1973 Allred 201/22,136,113 11/1938 Loftus 201/2 Primary ExamirzerNorman Yudkoff AssistantExaminerD. Sanders Attorney, Agent, or Firm-Clarence A. OBrien; HarveyB. Jacobson MANIFOLD [451 Nov. 12, 1974 end of either a door or doorjambto be cleaned. and a second header arranged for directing steam ontosealing surfaces at the top end of the same door or doorjamb. A thirdheader is mounted on a carriage movable between the first and secondheaders for directing steam onto sealing surfaces between the top andbottom ends. The cleaning apparatus has a main frame provided withspaced ends, between which extends a guide rail guidingly engaged by thecarriage. When specifically intended to be used for cleaning a coke ovendoor, the first and second headers are pivotally mounted on the mainframe; the travel of the third header on the carriage is used to swingthe first and second headers in a plane passing between the ends of themain frame when the third header is adjacent the first or second header.Further, this same movement of the third header is used tointermittently actuate valves supplying steam to the first and secondheaders. When specifically intended to clean a coke oven doorjamb, thefirst and second headers are mounted on a pair of further carriages alsoarranged engaging the guide rail and connected to the chain sprocketarrangement. These first and second headers are arranged so that thethird header, which is also pivotally mounted on its carriage, and thefirst and second headers will swing in a plane passing between the endsof the main frame at appropriate times in an operating cycle of theapparatus. Advantageously, the steam used by a cleaning apparatusaccording to the present invention is dry steam under a pressure of 250psi.

4 Claims, 11 Drawing Figures enemas PATENILUPISV 1 21974 3.847 753 rSOLENOID VALVE PAH-INTEL w 1 21914 SOLENOID VALVE SPROCKET .1 COKE OVENDOOR AND JAMB CLEANERS BACKGROUND OF THE INVENTION 1. Field of theInvention This invention relates generally to cleaning apparatus, andparticularly to steam cleaning apparatus mountable on pusher and doorcars for cleaning a selfsealing door assembly of a coke oven- 2.Description of the Prior Art Coke ovens are a great cause of airpollution. One of the reasons for this pollution is that the door sealsand sealing surfaces of mating doors and doorjambs are not kept clean.When a door seal makes contact with an associated doorjamb, carbon andother deposits left on the seals cause leakage by the door, permitting aflame in the furnace which in turn makes smoke.

Apparatus has been proposed to clean carbon and other foreign matterfrom the door seals of coke ovens. This seal is a surface around theinside of a coke oven door. There are usually two doors on each oven atany given coke oven site, one side of the oven being called the cokeside and the opposite side being called the pusher side.

Mechanical jamb cleaners, such as shown in U.S. Pat. No. 2,986,758, arebeing used for reducing this air pollution by cleaning the sealingsurfaces of a coke oven door assembly. Apparatus similar to this priorart device has found limited use in this country due to high costs, highoverhead, and low efficiency. Further, the metal scrapers of this typeof jamb cleaner have been found unsatisfactory as far as cleaning isconcerned, and the cleaners have many mechanical parts which malfunctionand cause excessive downtime and repair costs. For example, complexcarriages are used to position the apparatus adjacent a door to becleaned.

Another approach to solving the seal-cleaning problem referred to aboveis shown in, for example, U.S. Pat. No. 3,454,426. This proposal usesgas jets to clean both the door and doorjambs of a coke oven. The highvelocity gas jets generated by this prior art system have also beenfound unsatisfactory in that the desired degree of cleaning andefficiency of operation is not obtained.

SUMMARY OF THE INVENTION It is an object of the present invention toprovide apparatus utilizing steam under high pressure for cleaningsealing surfaces of a door assembly for a coke oven.

Another object of the present invention is to provide apparatus as setout above which eliminates the need for carriages for supporting thecleaning apparatus, and which send the apparatus into horizontaltransverse, or retraction movements for positioning the apparatus priorto cleaning.

Yet another object of the'present invention is to provide apparatus asset out above which has fewer moving and replaceable mechanical parts.

These and other objects are achieved according to the present inventionby providing apparatus having steam-directing arrangements for cleaningspaced portions of the sealing surfaces of a member to be cleaned, andanother steam-directing arrangement movable between the spaced sealingsurface portions for cleaning other portions of the sealing surfaces ofthe member.

The spaced-portions cleaning arrangement advantageously includes aheader arranged for directing steam onto the sealing surfaces at thebottom end of a memher to be cleaned, and a further header arranged fordirecting steam onto the sealing surfaces at the top end of the memberto be cleaned. In all preferred embodiments of the present invention,the movable cleaning means includes a carriage and header mounted on thecarriage for vertical movement between the spacedportions headers.

Apparatus according to the present invention is advantageously supportedby a main frame having spaced ends. A guide rail is mounted on the mainframe and arranged extending between the frames ends, with the carriagearranged guidingly engaging the guide rail for being moved between thespaced-portions headers by means of a chain and sprocket arrangement.

When cleaning apparatus according to the present invention isspecifically intended for cleaning a door of a door assembly for a cokeoven, the spaced-portions headers are pivotally mounted on the mainframe. Structure is associated with the three headers for swinging aspaced-portions header in a direction toward the ends of the frame, orparallel to a plane passing through the frame ends, when thecarriagemounted header is adjacent the headers, and a control systemintermittently actuated by movement of the header for supplying steam tothe spaced-portions headers as the carriage-mounted header approachesone of the spaced-portions headers.

When apparatus according to the present invention is specificallyintended for cleaning a doorjamb of a door assembly for a coke oven, thespaced-portions cleaning arrangement further includes a pair of furthercarriages engaging the guide rail and connected to the chain andsprocket. The spaced-portions headers are pivotally mounted on arespective further carriage, and the third header is pivotally mountedon its carriage. 'By design, all three headers are arranged for swingingmovement toward theends of the frame at a predetermined stage in anoperating cycle of the cleaning apparatus.

The various headers in all embodiments of cleaning apparatus accordingto the present invention preferably direct dry steam under a pressureof, for example, 250 psi onto the sealing surfaces.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary, perspectiveview showing a coke oven door cleaner according to the present inventionaffixedly mounted on existing beams of a pusher car.

FIG. 2 is a fragmentary, rear elevational view showing the door cleanerof FIG. 1.

I FIG. 3 is a fragmentary, sectional view taken generally along the line33 of FIG. 2.

FIG. 4 is a sectional view taken generally along the line 4-4 of FIG. 2.

FIG. 5 is a fragmentary, perspective, detail view taken generally alongthe line 55 of FIG. 3.

FIG. 6 is a top plan view, with some portions cut away and some parts insection, of the door cleaner of FIGS. 1 to 5.

FIG. 7 is a fragmentary, perspective view showing a coke oven doorjambcleaner according to the present invention.

FIG. 8 is a fragmentary, side elevational view showing the doorjambcleaner of FIG. 7.

FIG. 9 is a sectional view taken generally along the line 99 of FIG. 8.

FIG. 10 is a fragmentary, sectional view taken generally along the line1010 of FIG. 9.

FIG. 11 is a fragmentary, sectional view taken generally along the line11l1 of FIG. 9.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 of the drawings shows acoke oven door cleaner 10 according to the present invention fixedlymounted on existing beams 12, or structural vertical supports, of aconventional pusher car (not shown). An example of a horizontal cokeoven arrangement having a pusher car and a door car may be found in, forexample, US. Pat. No. 2,986,758 referred to above. This patent wasissued June 6, 1961 to G. E. C. Randell et al. While the door cleaner 10is fixedly mounted on the pusher car, it may be mounted for swingingmovement about a vertical axis on the door car. This mounting may besimilar to the mounting for a jamb cleaner on the pusher car set outbelow.

Referring now to FIGS. 2 to 6 of the drawings, cleaner 10 has a mainframe 14 provided with longitudinally spaced end portions which will beadjacent the bottom and top ends ofa door when cleaner 10 is inoperative position. A conventional electric drive, speed reducer 16 ismounted on the bottom of frame 14 for driving a lower roller chain 18through a lower chain sprocket 20. A lower chain sprocket 22 cooperateswith sprocket to define a power transmission path for chain 18. Aconventional electric solenoid valve 24 is connected to a pipe ell 26arranged beneath a lower frame bracket 28 connected to main frame 14.Valve 24 and ell 26 form part of a steam transmission system to bediscussed in more detail below.

A flexible steam hose 30 is connected to valve 24 and to a steammanifold 32, which is in turn connected to a steam header 34. Aplurality of steam nozzles 36 are provided in header 34 for directing asteam jet onto a sealing surface. A pipe 38 forming part of manifold 32is pivotally mounted on lower frame bracket 28 as by a pair of lowermanifold pivot brackets 39. A spring steel rod 40 is connected between apair of steam header pivot arms 41 forming longitudinal extensions ofportions of manifold 32. A main steam pipe 42, which leads from aconventional high pressure boiler (not shown), connects at a pipe tee 44to a vertical steam pipe 46 which is connected at its lower end to ell26 A main roller chain 48 is mounted on a drive sprocket 50, which iscoaxially associated with sprocket 22, and on an upper chain sprocket52. This chain 48 moves a header in a manner to be discussed below.

A guide rail 54, a pair of such rails shown as cooperating to form aguide which, guidingly, engagingly receives a carriage frame 56 (FIG. 5)as by means of four cam rollers 58. A slot 60 is provided in carriage 56for receiving a steam operator carriage tram pin 62 connected to a pinof a link of chain 48 for moving carriage S6.

A traveling steam manifold 64 is mounted on carriage frame 56 formovement with it between the ends of frame 14. A swivel pipe ell 66 ismounted on manifold 64, and a pipe tee 68 and conventional electricsolenoid valve 70 on steam pipe 46. A swivel pipe ell 72, connected tovalve 70, forms a connection for one end of a flexible steam hose 74,the other end being connected to ell 66. A manifold 76 is mounted on andextends from manifold 64, and terminates in a header 77 provided with aplurality of nozzles 78 arranged for directing steam onto predeterminedsealing surfaces of a member to be cleaned. Rod bumper brackets 80extending above and below manifold 64 are arranged for engaging withspring steel rod 40 of pivot arm 41, and with a similar spring rodassociated with an upper header to be discussed below, for pivoting theend, or spaced-portions headers when manifold 64 approaches anassociated end position.

An upper steam manifold 82 (FIG. 6) has a pipe portion 84 pivotallymounted on frame 14. An upper steam header 86 is arranged at the outwardend of manifold 82, and is provided with a plurality of nozzles 88. Aflexible steam hose 90 is connected to pipe 46 as by a pipe ell 91, andto pipe 84. A pair of steam header pivot arms 92, similar to arms 41,extend longitudinally from portions of manifold 82, and have connectedbetween them a spring steel rod 94. This rod 94 operates in a mannersimilar to rod 40, and is arranged to be engaged by the upper bracket80. Pipe 84 is connected to frame 14 as by a pair of top manifold pivotbrackets 96. An upper frame bracket 98, similar to lower frame bracket28, caps off the assembly.

A conventional electric solenoid valve is arranged between pipe ell 91and pipe 46. An electric operator 102, which may be a conventional limitswitch, a conventional electric timer switch 104, and another electricoperator 106 are arranged mounted on frame 14 for controlling thevarious solenoid valves in a known manner and in an operating sequenceto be set out below.

A heat shield 108 is arranged extending longitudinally between the endsof frame 14, and between carriage frame 56 and a door to be cleaned, forprotecting the carriage frame, sprocket chain, and other elements fromexposure to high heat which may be encountered during the cleaning of acoke oven door. This heat shield 108 has a backing plate 110 whichprovides a chamber affording further protection to the equipment.

As can be seen from FIG. 3 of the drawings, manifold 64 is provided witha steam operator vane 112 forming a chamber in conjunction with anaffixed steam operator chamber wall 114. A suitable, known packingarrangement seals manifold 64 with respect to manifold 76. Achamber-to-header port 116, in a portion of manifold 76 arranged inmanifold 64, provides communication with the space between vane 112 andwall 114 so that steam may pass through manifold 76, headers 77, nozzles78, and onto a door 118. Vane 112 is connected in a known manner to theportion of manifold 76 in manifold 64. Specifically, the steamdischarged by nozzle 78 is directed onto vertical sealing surfaces 120,while nozzles 36 and 88 are arranged for directing steam onto horizontalsealing surfaces 122.

Although the control and actuation systems, set out above, have beenreferred to as electrical, it is to be understood that fluid and othersuitable systems may be used if desired.

When a door 118 is to be cleaned, an operator will align the door withcleaner as shown in FIGS. 3, 4, and 6. For the door car side of theoven, the cleaner will be swung out about vertical pivots and alignedwith the door. With main steam on pipe 42, the operator may open valve70 and act on vane 112 to cause manifold 76 to rise horizontally fromthe fragmentary, broken line position shown in FIG. 3 to the horizontalbroken line position. After manifold 76 is in the horizontal position,the operator may actuate speed reducer 16 and transmit motion throughchain 48 so that carriage frame 56 is moved vertically until it contactsoperator 102. Closing of operator 102 opens valve 100 and sends steamthrough header 86. At the moment of contact of manifold 64, which may beconsidered a traveling steam operator, with operator 102, spring steelrod 94 is also contacted, sending steam header 86 in a downward orcounterclockwise motion (FIG. 3) and cleaning horizontal sealingsurfaces 122 of door 118.

Now manifold 25 reverses to downward vertical motion leaving header 86in upward or full line position as shown in FIG. 3. This full lineposition may be determined by balancing the header 86 unit. Manifold 25continues its downward travel passing through operator 102 and closingvalve 100, through timer switch 104, and making contact with controlswitch or operator 106. The latter opens valve 24 and sends steamthrough header 34. Manifold 64 now makes contact with spring steel rod40 sending header 34 in vertical swinging motion. As manifold 64 returnsupward, it passes by operator 106 cleaning, or releasing same. Thelatter closes valve 24 to stop steam to header 34. Manifold 64 now hitstimer switch 104 and breaks the electric circuit to the switch tocomplete one cleaning cycle. The operator may now close valve 70 andcause manifold 76 to drop to its vertical position. Timer switch 104controls the length of cycle.

When manifold 64 is in motion, manifold 76 is directing dry steam at 250psi through steam nozzle 78 and cleaning the vertical sealing surfaces120 on both sides of door 118. Headers 34 and 86 also direct dry steamat 250 psi when actuated.

Referring now to FIG. 7 of the drawings, a doorjamb cleaner 210according to the present invention is shown mounted to a jamb cleanercarriage 212 of a pusher car for swinging movement about a verticalaxis. This axis is illustrated in FIG. 8 as formed by pins 213. When ajamb cleaner 210 is mounted on a door car, it may be fixedly mounted andmerely be positioned across from a doorjamb by control of the door car.

Jamb cleaner 210 is shown in greater detail in FIGS. 8 to 11 of thedrawings. As can be readily appreciated from FIG. 8 of the drawings, amain frame 214 of cleaner 210 has an electric driven, speed reducer 216,similar to reducer 16, mounted at the lower end of frame 214. Reducer216 drives a lower chain 218 through a speed reducer chain sprocket 220.A lower chain sprocket 222 completes the lower chain arrangement. Alower header solenoid operated steam valve 224 communicates with a lowerheader steam operator 226. A lower frame bracket 228, similar to bracket28, finishes the bottom of frame 214.

A flexible steam hose 230 is connected at a one end to steam operator226 for feeding steam to a lower steam manifold 232. A lower steamheader 234 is connected to manifold 232, and is provided with aplurality of nozzles 236 arranged for directing steam onto the lowerportion of a doorjamb. To the rear of manifold 232 is mounted a lowersteam manifold counterweight 240 which tends to keep manifold 232 andheader 234 in their broken line position when steam is not passingthrough nozzles 236. A main steam line 242, which leads from aconventional high pressure boiler (not shown) is connected as by a pipetee 244 to a vertical steam pipe 246. A conventional pipe coupling 247couples hose 230 to pipe 246.

A traveling steam operator tram roller chain 248 is arranged about alower chain sprocket 250, which is coaxially associated with sprocket222 for receiving power from reducer 216, and an upper chain sprocket252. Chain 248 functions and operates in a similar manner to chain 48.

A carriage guide rail 254 (FIG. 10) is arranged in a similar manner toguide rail 54 for guiding a carriage frame 256 by means of guidinglyengaging carriage cam rollers 258. Although four such rollers 258 areillustrated, it is to be understood that any desired number maybe used.A steam operator carriage tram pin 262 engages a slot (not shown) incarriage frame 256 for moving same between the ends of frame 214.

A traveling steam operator 264 is mounted on carriage frame 256 fortravel with the carriage frame. A swivel ell 266 provides one connectionto operator 264. A pipe tee 268 is provided in pipe 246, and an electricsolenoid operated steam valve 270 is connected to tee 268. A swivel ell272 is in turn connected to valve 270, and a flexible steam hose 274extends between ell 272 and 266. A traveling steam manifold 276 ispivotally mounted on operator 264, and terminates in headers 277provided with a plurality of nozzles 278. Manifold upper stop brackets280 limit the upward swing of manifold 276 to a substantially horizontalposition, as shown in full lines in FIG. 8.

An upper header steam operator 282 has pivotally connected to it amanifold 284 at the outer end of which is arranged an upper steam header286 provided with a plurality of nozzles 288. A flexible steam hose 290is connected to pipe 246 as by a conventional steam pipe coupling 292.An upper frame bracket 298, similar to upper frame bracket 98, caps offframe 214.

An upper header, solenoid operated steam valve 300 is arranged onoperator 282, and is actuated by an electric switch or operator 302mounted on frame 214. An electric timer switch 304 and an electricswitch or operator 306 are arranged on main frame 214 in positionssimilar to those fortimer switch 104 and operator 106.

. 264 to form a steam chamber communicating with a chamber-to-headerport 316. Vane 312 operates in a manner similar to vane 112 to positionmanifold 276. That is, vane 312 is connected in a known manner to aportion of manifold 276 passing through manifold 264. The variousnozzles on jamb cleaner 210 are arranged for directing dry steam into adoorjamb 318 having vertical sealing surfaces 320 and horizontal sealingsurfaces 322. Operators 226 and 282 may be constructed in a similarmanner to operator 264.

To use jamb cleaner 210, an operator first lines the cleaner up with ajamb 318. Main steam is placed on pipe 242. The operator may now openvalve 270 and cause manifolds 276 and 284, by vane action, to rise totheir horizontal or full line positions in FIG. 8. Manifold 232 will beforced down to its horizontal or full line position. Once this has beenaccomplished, the operator may put speed reducer 216 into motion sendingtraveling steam operator 264 in vertical travel from its FIG. 8 positionuntil it makes contact with operator 302. Closing of operator 302 willopen valve 300 and send steam through header 286. At the instance ofcontact of operator 302 by traveling steam operator 264, the lattercontacts steam operator 282 and sends steam header 286 vertically acrosshorizontal sealing surfaces 322 of the seal of doorjamb 318.

Now steam operator 264 reverses to downward motion and leaves steamoperator 282 at its original location, passes through operator 302, andas a result of the latter closes valve 300. Steam operator 264 continuesin motion crossing timer switch 304, and continues on to make contactwith electric operator 306 and steam operator 226. Valve 224 is nowopened and steam is sent through header 234 so that the latter is forceddown across the lower or bottom horizontal sealing surface 322 ofdoorjamb 318. Steam operator 226 reverses vertically crossing operator306, closing valve 224, and leaving steam operator 226 at its originalposition. Steam operator 264 continues vertically upwardly makingcontact with timer switch 304 and breaking the electric circuit tocomplete a one cycle cleaning operation. Operator may now break thecircuit of valve 270 causing manifold 276 and manifold 284 to drop totheir vertical, or broken line positions in FIG. 8, and causing header234 to rise to its vertical or broken line position.

When steam operator 264 is in motion, steam headers 277 are directing250 psi of dry steam through nozzles 278 and cleaning the verticalsealing surfaces 320 on both sides ofjamb 318. Headers 234 and 286 alsodirect 250 psi of dry steam when actuated.

As can be readily understood from the above description and from thedrawings, cleaners 10, 210 according to the present invention willefficiently clean sealing surfaces of door assemblies for coke ovenswith a minimum of moving parts and a reduced possibility of mechanicalfailure and resulting downtime and high maintenance costs.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction and operation shown anddescribed, and accordingly all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention.

What is claimed as new is as follows:

1. Apparatus for cleaning sealing surfaces of a door assembly for a cokeoven, comprising, in combination:

a. first header means for cleaning sealing surfaces at a one end of amember to be cleaned;

b. second header means for cleaning sealing surfaces at another end ofthe member to be cleaned; c. a carriage arranged for movement along apath between the first and second header means; d. third header meansmounted on the carriage for movement therewith; e. means associated withthe first, second, and third header means for swinging the first andsecond header means about respective pivots arranged perpendicularly tothe path of movement of the carriage and parallel to the door assemblywhenever the carriage is adjacent the first and second header means; aframe having spaced ends, a guide rail mounted on the frame and arrangedextending between the ends of the frame, the carriage arranged engagingthe guide rail, and means for moving the carriage along the guide railbetween the first and second header means, the first, second, and thirdheader means being steam directing headers, the first and second headermeans being pivotally mounted on the frame adjacent respective endsthereof, and the path of movement of the carriage being a verticallinear path; and g. means actuated by the third header means forintermittently and alternately supplying steam to the first and secondheader means whenever the carriage is adjacent same.

2. A structure as defined in claim 1, wherein the header means all arearranged for directing dry steam under a pressure of approximately 250psi onto the sealing surfaces.

3. A structure as defined in claim 1, further including a pair offurther carriages engaging the guide rail and connected to the movingmeans, the first and second header means pivotally mounted on arespective further carriage, and the third header means pivotallymounted on the carriage, all three header means arranged for swingingmovement between the spaced ends of the frame.

4. A structure as defined in claim 1, wherein the frame is arranged withthe ends thereof spaced vertically, one end being an upper end and theother end a lower end, with the first and second header means beingarranged for swinging about a horizontal pivot, the guide rail is a pairof spaced parallel guide rails cooperatively arranged forming a guide,and the moving means includes a pair of chain sprockets rotatablymounted on the frame adjacent the upper and lower ends thereof, a chainarranged on the sprockets for movement therewith, a pin extending fromthe chain, a plurality of cam rollers provided on the carriage andarranged engaging the guide rails, and a slot provided in the carriageand arranged for receiving the chain pin and connecting the carriage tothe chain.

1. Apparatus for cleaning sealing surfaces of a door assembly for a cokeoven, comprising, in combination: a. first header means for cleaningsealing surfaces at a one end of a member to be cleaned; b. secondheader means for cleaning sealing surfaces at another end of the memberto be cleaned; c. a carriage arranged for movement along a path betweenthe first and second header means; d. third header means mounted on thecarriage for movement therewith; e. means associated with the first,second, and third header means for swinging the first and second headermeans about respective pivots arranged perpendicularly to the path ofmovement of the carriage and parallel to the door assembly whenever thecarriage is adjacent the first and second header means; f. a framehaving spaced ends, a guide rail mounted on the frame and arrangedextending between the ends of the frame, the carriage arranged engagingthe guide rail, and means for moving the carriage along the guide railbetween the first and second header means, the first, second, and thirdheader means being steam directing headers, the first and second headermeans being pivotally mounted on the frame adjacent respective endsthereof, and the path of movement of the carriage being a verticallinear path; and g. means actuated by the third header means forintermittently and alternately supplying steam to the first and secondheader means whenever the carriage is adjacent same.
 2. A structure asdefined in claim 1, wherein the header means all are arranged fordirecting dry steam under a pressure of approximately 250 psi onto thesealing surfaces.
 3. A structure as defined in claim 1, furtherincluding a pair of further carriages engaging the guide rail andconnected to the moving means, the first and second header meanspivotally mounted on a respective further carriage, and the third headermeans pivotally mounted on the carriage, all three header means arrangedfor swinging movement between the spaced ends of the frame.
 4. Astructure as defined in claim 1, wherein the frame is arranged with theends thereof spaced vertically, one end being an upper end and the otherend a lower end, with the first and second header means being arrangedfor swinging about a horizontal pivot, the guide rail is a pair ofspaced parallel guide rails cooperatively arranged forming a guide, andthe moving means includes a pair of chain sprockets rotatably mounted onthe frame adjacent the upper and lower ends thereof, a chain arranged onthe sprockets for movement therewith, a pin extending from the chain, aplurality of cam rollers provided on the carriage and arranged engagingthe guide rAils, and a slot provided in the carriage and arranged forreceiving the chain pin and connecting the carriage to the chain.